Entra Pharma Raises First Round

Entra Pharmaceuticals Inc., a Waltham, Mass.-based drug delivery startup, has raised $4.23 million in the first tranche of its Series A round, according to a regulatory filing. The round would be expanded to $12.5 million by November 30, 2009, based on the company reaching certain milestones. Backers include Flybridge Capital Partners and North Bridge Venture Partners.